| 摘要 |
The invention relates to a process for obtaining tetrahydrofuran from a stream comprising tetrahydrofuran, alkanol and high boilers, comprising the following steps: (a) removing a stream comprising tetrahydrofuran and alcohol as an azeotrope in a first distillation stage, (b) feeding at least a portion of the stream comprising tetrahydrofuran and alcohol as an azeotrope into a reactor for esterification of maleic anhydride to obtain a stream comprising tetrahydrofuran, possibly alkanol, possibly unconverted maleic anhydride and monoalkyl maleate, (c) separating the stream comprising monoalkyl maleate, tetrahydrofuran and possibly alkanol into a stream comprising monoalkyl maleate and a stream comprising tetrahydrofuran and possibly alkanol in a second distillation stage, (d) supplying the stream comprising tetrahydrofuran and possibly alkanol from the second distillation stage and the portion of the tetrahydrofuran and alkanol not supplied to the reactor as an azeotrope-comprising stream from step (a) into a third distillation stage in which a product stream comprising essentially tetrahydrofuran and a stream comprising tetrahydrofuran and alkanol are obtained, (e) recycling the stream comprising tetrahydrofuran and alkanol from the third distillation stage into the first distillation stage or into the reactor in step (b). |
